1Mix broth, corn, soy sauce, sherry, gingerroot, salt and white pepper in 3-quart saucepan. Heat to boiling over medium heat, stirring occasionally. Mix cornstarch and cold water. Stir cornstarch mixture, seafood and onions into broth mixture. Cook 1 to 2 minutes or until thickened; remove from heat.
2Beat egg whites slightly (not until foamy); pour slowly into broth mixture, stirring constantly with fork until egg whites form threads. Stir in 1 teaspoon vinegar and the sesame oil. Serve with pepper sauce and additional vinegar.